Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 3611-3630 of 4825
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The protective effect of plasma antioxidants during ozone autohemotherapy
(Academic Journals, 2008)Ozone (O3) therapy forms part of a group of complementary and alternative medical therapies and is gaining more and more interest worldwide. There is, however, some concern regarding O3-toxicity and uncertainty about the ... -
The protective role of oestradiol against silent myocardial ischemia and hypertension risk in South African men: the SABPA study
(Elsevier, 2017)Background Oestradiol has a protective effect on coronary artery health in women but the effect it has on men, is controversial. A translational approach was followed to assess whether sex hormone levels are associated ... -
Protein kinase C-delta (PKCδ), a marker of inflammation and tuberculosis disease progression in humans, is important for optimal macrophage killing effector functions and survival in mice
(Nature, 2018)We previously demonstrated that protein kinase C-δ (PKCδ) is critical for immunity against Listeria monocytogenes, Leishmania major, and Candida albicans infection in mice. However, the functional relevance of PKCδ during ... -
Protocol for acute and chronic ecotoxicity testing of the turquoise killifish Nothobranchius furzeri
(JoVE, 2018)The killifish Nothobranchius furzeri is an emerging model organism in the field of ecotoxicology and its applicability in acute and chronic ecotoxicity testing has been demonstrated. Overall, the sensitivity of the species ... -
Proton fluxes measured by the PAMELA experiment from the minimum to the maximum solar activity for solar cycle 24
(IOP Publishing, 2018)Precise measurements of the time-dependent intensity of the low-energy (<50 GeV) galactic cosmic rays (GCRs) are fundamental to test and improve the models that describe their propagation inside the heliosphere. In ... -
Prototulbaghia siebertii
(2011) -
Proximal sensor analysis of mine tailings in South Africa: an exploratory study
(Elsevier, 2017)Proximal sensors have rapidly developed in-situ analysis of soil and sediment. Two systems in particular, portable X-ray fluorescence (PXRF) spectrometry and visible near infrared diffuse reflectance spectroscopy (VisNIR ... -
The Psilostomidae Looss, 1900 (sensu stricto) (Digenea: Echinostomatoidea): description of three new genera and a key to the genera of the family
(Springer, 2017)Three new psilostomid genera, Byrdtrema n. g., Longisaccus n. g. and Macracetabulum n. g., each with a single species, are described from ducks, Aix sponsa (L.) and Bucephala albeola (L.) in North America. Byrdtrema n. g. ... -
PSR J1907+0602: a radio-faint gamma-ray pulsar powering a bright TeV pulsar wind nebula
(IOP Publishing, 2010)We present multiwavelength studies of the 106.6 ms γ-ray pulsar PSR J1907+06 near the TeV source MGRO J1908+06. Timing observations with Fermi result in a precise position determination for the pulsar of R.A. = 19h07m54fs7(2), ... -
PSR J2021+4026 in the gamma cygni region: the first variable γ-ray pulsar seen by the Fermi LAT
(IOP Publishing, 2013)Long-term monitoring of PSR J2021+4026 in the heart of the Cygnus region with the Fermi Large Area Telescope unveiled a sudden decrease in flux above 100 MeV over a timescale shorter than a week. The "jump" was near MJD ... -
Psychosocial health of an African group before awareness of HIV status: a comparative study
(Taylor & Francis, 2011)This study aimed to explore the psychosocial health profiles of people with and without HIV before they learned their infection status. A total of 1,025 participants (males = 386, females = 639, age range = between 32 and ... -
Psychosocial stress but not hypertensive status associated with angiogenesis in Africans
(Taylor & Francis, 2014)Aim. Increased angiogenic factors [vascular endothelial growth factor-A (VEGF-A) and angiopoietin-2 (Ang-2)] have been associated with vascular dysfunction and hypertension. Black Africans undergoing rapid urbanization ... -
Psychosocial well-being of people living with HIV and the community before and after a HIV stigma-reduction community "hub" network intervention
(NISC, 2016)The purpose of the research was to determine whether an HIV stigma-reduction community “hub” network intervention in a South African urban area would bring about a difference in the psychosocial well-being of people living ... -
Public participation in town–planning applications: Tlokwe local municipality as a case study
(University of the Free State. Dept of Town and Regional planning, 2013)Although public participation is deemed important in South Africa, negative perceptions of its legitimacy are widely acknowledged. Inclusive town-planning processes, as instruments to address inequality, have a significant ... -
Pull-Process-Push: Can a Tweaked Algorithm Improve Database Performance Significantly?
(Czech institute of academic education z.s, 2014)Design science research has two essential processes, design and evaluation, supported by various approaches. Two of these activities, namely problem identification and evaluation, require qualitative data to be gathered ... -
Pulsar emission in the very-high-energy regime
(Sissa Medialab, 2015)The vast majority of the pulsars detected by the Fermi Large Area Telescope (LAT) display spectra with exponential cutoffs falling in a narrow range around a few GeV. Early spectral modelling predicted spectral cutoff ... -
Pulsations from the Vela pulsar down to 20 GeV with H.E.S.S. II
(Sissa Medialab, 2015)The Vela pulsar (PSR J0835 − 4510) is the brightest persistent source in the high-energy γ-ray sky. It is a relatively near, young and energetic rotation-powered pulsar. Vela was a key target for the High Energy Stereoscopic ... -
Pulsed gamma rays from the original millisecond and black widow pulsars: a case for caustic radio emission?
(IOP Publishing, 2012)We report the detection of pulsed gamma-ray emission from the fast millisecond pulsars (MSPs) B1937+21 (also known as J1939+2134) and B1957+20 (J1959+2048) using 18 months of survey data recorded by the Fermi Large Area ... -
Pumping of the 4.8 GHz H2CO masers and its implications for the periodic masers in G37.55+0.20
(EDP Sciences, 2014)Context. Periodic or regular flaring of class II CH3OH masers in nine high mass star forming regions is now a well established phenomenon. Amongst the nine star forming regions, G37.55+0.20 is the only case at present ...